Octet Rule

Q. 20. What is the exact volume of gas a NTP and STP and what is the temperature and pressure at both comditions

Q. 35.Which bond overlapping is stronger s-s , s-p , p-p ?All are axial

Q. the number of nearest neighbours of each atom in ccp and bcc arrangement respectively is?

Q. two flasks of equal volumes have been joined by a narrow tube of negligible volume.Initially both flasks are at 300k containing 0.60 mol of O2 gas at 0.5 atm pressure.One of the flask is then placed in a thermostat at 600k.Claculate number of moles of O2gas in each flask

Q. 3. Benzyl radical is aromatic because it has 6p–orbitals and 7 unpaired electrons B6p–orbitals and 6 unpaired electrons C7p–orbitals and 6 unpaired electrons D7p–orbitals and 7 unpaired electrons

Q. 19. Which is not an exception to octet rule? a) BF3 b) Cl2O6 c) Cl2O7 d) Cl2O

Q. Based on the octet rule, boron will most likely form:

1. $B^{3-}$
2. $B^{+}$
3. $B^{3+}$
4. $B^{2+}$

Q. Which of the following alphabet have a five membered chain as a longest chain A F E H I K M T V W X Y Z (a) A E H (b) K M X (c) E M W (d) E WZ

Q. Which of the following atoms cannot exhibit expanded octet in their compounds?

1. C
2. N
3. O
4. All of the above

Q.

Which one of them is an odd-electron molecule?

1. BCl₃

2. NO

3. CO₂

4. SF₆

Q. 14.Compare the C-H bond lenth of C2H2, C2H4, C2H6.

Q.

Among the following molecules octet rule is not obeyed by:

1. ClF₃

2. OF₂

3. PCl₃

4. CO₂

Q. Na2[Fe(CN)5NO] Na4[Fe(CN)5NOS] (nitroprusside + Na2S) Na2[Fe(CN)5NOS](nitroprusside + H2S) In all these compounds oxidation state of Fe is +2 ?

Q. A gas undergoes a process in which its pressure P and volume V are related as VP^{2/3} =cons†an t the bulk modulus of the gas in the process is

Q. 19. Markovnikovs rule is not applicable in (1) 2-pentene (3) 1-butene (2) 1-pentene (4) 2-butene

Q. 11. Given that the oxidation state of sulphur is -2, theeq. wt of sulphur is(1) 16(2) 323) 9(4) 4

Q. Which of the following statement(s) is/are true regarding Lewis theory?

1. It considers only valence electrons
2. Noble gases will not involve in chemical bonding
3. Elements can attain octet by sharing the electrons
4. All of the above

Q.

Which of the following option w.r.t increasing bond order is correct

1. < O₂^-1< C₂< NO

2. NO < C₂< O₂^-1<

3. < O₂^-1< NO < C₂

4. C₂< NO < < O₂^-1

Q. dipole moment is zero for which of the following pair of molecules 1] BF3 , SO2 2] BF3 , CCl4 3] SO2 , CHCl3 4]CCl4 SO2

Q.

Element X is strongly electropositive and Y is strongly electronegative. Both are univalent. The compound formed would be:

1. X – Y

2. X⁻ Y⁺

3. X⁺Y⁻

4. X → Y

Q.

The value of universal gas constant R depends on:

1. Temperature of gas

2. Volume of gas

3. Number of moles of gas

4. Units of volume and pressure

Q. In S4O6-2 what is the oxidation state and formal charge of each sulphur at

Q. 86. What is oxidation number oc manganese in KMnO4

Q. Will the energy level of the outermost valence shell will have highest energy as compared to that of energy level of inner orbitals

Q. 73. The stable Oxidation state of Sulphur can be +2, still SF2 is not possible. Why?

Q.

The atomic number of magnesium is 12, it will achieve its stable electronic configuration by donating _______ number of electrons.

1. 6

2. 5

3. 4

4. 2

Q. 60 What is the role of covalent bonding in melting point and boiling point?

Q. The C-C-Cl angle is 1, 1, 2, 2-tetrachloroethene and tetrachloromethane respectively(1) 109.5 and 90(2) 120 and 109.5(3)90^° and 109.5(4)109.5^° and 120^°

Q. N2O4 is in equilibrium with 2 NO2 .Is reaction exothermic or endothermic?

Q. C2h4+nbs+ccl4=?